Question about 1995 Mercury Grand Marquis

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Where is the heater core valve in a '95 grand marquis

'95 marquis enviro unit will not send heat

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It is usually in line in the heater hose from the block to the heater core. it looks like a mushrom with a linkage on it.

Posted on Feb 19, 2009

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1 Answer

My 1984 grand marquis does not get heat


did everything said to do put new heater core in and a new thermostat instill no heat

Oct 08, 2012 | 1984 Mercury Grand Marquis

1 Answer

Air conditioner blows heated air


Sounds like ??
If the compressor is running and the system is full of freon, you may have a blend door problem under the dash. The blend door directs air flow thru the heater core and evaporator core depending on the temp setting on the dash.

Jul 24, 2012 | 2000 Mercury Grand Marquis

1 Answer

The heat in the car doesn't turn to hot air until


The antifreeze goes into the cooling system through the cap the same way you'd fill the system during normal car maintenance. You may have another issue as well. There is usually a vacuum or electrically operated shut off valve in line in the heater hoses. Its typically located on the passenger's side close to the firewall under the hood. Its purpose is to keep hot antifreeze from flowing into the heater core when the air conditioning is on. If this valve, a temp sending unit that works in conjunction with this valve or the climate control or a break in the electrical circuit or vacuum line or valve isn't working properly, the symptoms that you describe could and likely would arise. You can usually move this valve open or closed manually to test. Check and repair or replace accordingly if low antifreeze doesn't rectify the problem. Good luck!

Jan 17, 2012 | 2003 Mercury Grand Marquis

1 Answer

I have no heat blowing into my 2002 Mercury Grand Marquis.


Sounds like there is no coolant flowing INTO the heater core to me. There is usually a valve that opens to allow coolant to pass thru the heater core. some are electrical, some are vacuum operated. My suspicion is that you have a bad valve, or no power or vacuum supply to that valve.

Jan 13, 2012 | 2002 Mercury Grand Marquis

1 Answer

1998 mercury grand marquis heater doesnt work only cold air comes out the air cond works fine the enginecoolant is new, the engine doesnt overheat.


Either your heater control valve is not properly operating or your heater core is clogged. Locate the heater control valve under the hood, should be close to firewall on heater hose, have someone adjust temperature from hot to cold and see if you can see the heater control valve operating if so replace the heater core, if its not doing anything replace it(heater control valve).

Feb 19, 2011 | 1998 Mercury Grand Marquis

1 Answer

I do not have any heat in my 1996 grand marquis


could be heater control or plugged heater core.. heater core could be cleaned out by unhooking heater hoses and running water through or a radiator flush.. if its your valve youll need to replace..

Feb 06, 2011 | 1996 Mercury Grand Marquis

1 Answer

No heat,replaced heater coil but no heat when switch on to the heat,fan comes on but no heat


No heat = no motion. If there is no heat in your car there is no molecular motion (no molecular bond) and the world as you know it will literally fall apart. Won't even be elements left, just random neutrons being pounded by protons and electrons colliding at an alarming rate.
Assuming you mean that your A/C works fine and the only problem is the air being blown out is not warm as it should be on heat, could be a couple of things.
Valve not sending coolant to heater core. To check this just warm the car up, turn on the heater, and pop the hood. Find where the heater core hoses connect at the firewall. Feel each side (in and out), they should both be very warm. If not very warm, your heater core is not getting any heated water to share with you in the cabin. Follow the hoses from the firewall to wherever they go. If there is a device connected inline, feel both sides of it. If the 'other' side is hot, the valve isn't turning on. This is what you hope the problem is, cheap and easy.
Blend door not operating properly. This is the flapper door within your heater/AC box that puts air through the heater core or the AC core. Checking or fixing it means removing the dash, which isn't any fun. Hope it's the valve above.


good luck

Dec 15, 2010 | 1997 Mercury Grand Marquis

1 Answer

No heat in my 98 Grand Marquis


are you shure that you dont have trapped air in the heater core? get a big funnel that will fit tightly in the radiator filler and fill with coolant and run the car to normal operating temp and watch for the level to drop or bubbles to evacuate into the funnel. on really stubborn air locks i have had to squeeze the hoses to pump water through the heater core.





































































Jan 20, 2009 | 2000 Mercury Grand Marquis

1 Answer

'95 mercury grand marquis enviro unit will not send heat. Fan ,ac,and breakers all good.


might be your thermostat, also make sure the fluid level is correct. it only takes a small amount of low coolant to drop the heat.

Nov 27, 2008 | 1995 Mercury Grand Marquis

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